Downlight apparatus

ABSTRACT

A downlight apparatus includes a light source, a light holder, a driver box, a fixing bracket and two torsion springs. The light holder is used for placing the light source. The light holder has a first side defining a light opening. The driver box is placed on a second side of the light holder. The driver box contains a driver for converting an external power to a driving current supplied to the light source to emit a light from the light opening. The fixing bracket is coupled to the light holder for fixing to an installation cavity. The fixing bracket has a bottom plate and two connector plate. The bottom plate is fixed to the second side of the light holder. The two connector plates are disposed vertically to the bottom plate. Each connector plate has two side units. Each torsion spring has an elastic center and two arms.

FIELD

The present invention is related to a downlight apparatus, and moreparticularly related to a downlight apparatus with an easy assembly.

BACKGROUND

The time when the darkness is being lighten up by the light, human havenoticed the need of lighting up this planet. Light has become one of thenecessities we live with through the day and the night. During thedarkness after sunset, there is no natural light, and human have beenfinding ways to light up the darkness with artificial light. From atorch, candles to the light we have nowadays, the use of light have beenchanged through decades and the development of lighting continues on.

Early human found the control of fire which is a turning point of thehuman history. Fire provides light to bright up the darkness that haveallowed human activities to continue into the darker and colder hour ofthe hour after sunset. Fire gives human beings the first form of lightand heat to cook food, make tools, have heat to live through cold winterand lighting to see in the dark.

Lighting is now not to be limited just for providing the light we need,but it is also for setting up the mood and atmosphere being created foran area. Proper lighting for an area needs a good combination ofdaylight conditions and artificial lights. There are many ways toimprove lighting in a better cost and energy saving. LED lighting, asolid-state lamp that uses light-emitting diodes as the source of light,is a solution when it comes to energy-efficient lighting. LED lightingprovides lower cost, energy saving and longer life span.

The major use of the light emitting diodes is for illumination. Thelight emitting diodes is recently used in light bulb, light strip orlight tube for a longer lifetime and a lower energy consumption of thelight. The light emitting diodes shows a new type of illumination whichbrings more convenience to our lives. Nowadays, light emitting diodelight may be often seen in the market with various forms and affordableprices.

After the invention of LEDs, the neon indicator and incandescent lampsare gradually replaced. However, the cost of initial commercial LEDs wasextremely high, making them rare to be applied for practical use. Also,LEDs only illuminated red light at early stage. The brightness of thelight only could be used as indicator for it was too dark to illuminatean area. Unlike modern LEDs which are bound in transparent plasticcases, LEDs in early stage were packed in metal cases.

In 1878, Thomas Edison tried to make a usable light bulb afterexperimenting different materials. In November 1879, Edison filed apatent for an electric lamp with a carbon filament and keep testing tofind the perfect filament for his light bulb. The highest melting pointof any chemical element, tungsten, was known by Edison to be anexcellent material for light bulb filaments, but the machinery needed toproduce super-fine tungsten wire was not available in the late 19thcentury. Tungsten is still the primary material used in incandescentbulb filaments today.

Early candles were made in China in about 200 BC from whale fat and ricepaper wick. They were made from other materials through time, liketallow, spermaceti, colza oil and beeswax until the discovery ofparaffin wax which made production of candles cheap and affordable toeveryone. Wick was also improved over time that made from paper, cotton,hemp and flax with different times and ways of burning. Although not amajor light source now, candles are still here as decorative items and alight source in emergency situations. They are used for celebrationssuch as birthdays, religious rituals, for making atmosphere and as adecor.

Illumination has been improved throughout the times. Even now, thelighting device we used today are still being improved. From theillumination of the sun to the time when human can control fire forproviding illumination which changed human history, we have beenimproving the lighting source for a better efficiency and sense. Fromthe invention of candle, gas lamp, electric carbon arc lamp, kerosenelamp, light bulb, fluorescent lamp to LED lamp, the improvement ofillumination shows the necessity of light in human lives.

There are various types of lighting apparatuses. When cost and lightefficiency of LED have shown great effect compared with traditionallighting devices, people look for even better light output. It isimportant to recognize factors that can bring more satisfaction andlight quality and flexibility.

Downlight devices are widely used in various places. It is beneficial tofind out improvements of downlight devices to provide a more convenientand more safe downlight products.

In addition, it is important to provide a convenient assembly structure.The structure includes complexity reducing during manufacturing andduring installation. Downlight devices are widely used in variousplaces. It is beneficial to find out improvements of downlight devicesto provide a more convenient and more safe downlight products.

In addition, it is important to provide a convenient assembly structure.The structure includes complexity reducing during manufacturing andduring installation. Downlight devices are widely used in variousplaces. It is beneficial to find out improvements of downlight devicesto provide a more convenient and more safe downlight products.

In addition, it is important to provide a convenient assembly structure.The structure includes complexity reducing during manufacturing andduring installation. Downlight devices are widely used in variousplaces. It is beneficial to find out improvements of downlight devicesto provide a more convenient and more safe downlight products.

In addition, it is important to provide a convenient assembly structure.The structure includes complexity reducing during manufacturing andduring installation.

SUMMARY

In some embodiments, a downlight apparatus includes a light source, alight holder, a driver box, a fixing bracket and two torsion springs.

The light holder is used for placing the light source. The light holderhas a first side defining a light opening.

The driver box is placed on a second side of the light holder.

The driver box contains a driver for converting an external power to adriving current supplied to the light source to emit a light from thelight opening.

The fixing bracket is coupled to the light holder for fixing to aninstallation cavity.

The fixing bracket has a bottom plate and two connector plate.

The bottom plate is fixed to the second side of the light holder.

The two connector plates are disposed vertically to the bottom plate.

Each connector plate has two side units.

Each torsion spring has an elastic center and two arms.

The two arms are elastically spreading with different angles withrespect to the elastic center.

The two torsion springs are attached to a lateral side of the twoconnector plates.

Either the two torsion springs are elastically squeezed to engage theinstallation cavity or the side units of the connector plates areelastically squeezed to engage the installation cavity.

In some embodiments, the installation cavity is a cavity in a junctionbox.

In some embodiments, the bottom plate of the fixing bracket has acentral hole for the driver box to pass through.

In some embodiments, the driver box has an elastic hook.

When the central hole of the bottom plate passes reaches a bottom edgeof the driver box, the elastic hook locks the bottom plate to the secondside of the light holder.

In some embodiments, the bottom plate has multiple connection holes forfixing the bottom plate to the installation cavity with bracketconnectors.

In some embodiments, the connection hole is a key hole with an largerentrance and a smaller siding track.

The bracket connector enters the larger entrance and then stays in thesliding track to fix the bottom bracket to the installation cavity.

In some embodiments, the connector plates are detachable from the bottomplate.

In some embodiments, the connector plates are fixed to the bottom platewith screws.

In some embodiments, the two side units are two folded plates foldingwith respect to a main body of the connector plate.

In some embodiments, a folding angle of the folded plate with respect tothe main body of the connector plate is larger than 90 degrees.

In some embodiments, the connector plates are made as the same metalpiece as the bottom plate and are folded vertically with respect to thebottom plate.

In some embodiments, the fixing bracket has a scraper for scraping aportion of electric insulation layer on the second side of the lightholder for electrically connecting the light holder to ground.

In some embodiments, the light source includes multiple LED modulesdistributed in a first range.

The bottom plate has a larger size than the first range to carry heat ofthe first range outside the first range.

In some embodiments, the bottom plate has multiple bracket connectors.

The second side of the light holder has corresponding multiple holderconnectors.

The bracket connectors are respectively slided to engage the holderconnectors by rotating the light holder with respect to to the fixingbracket.

In some embodiments, a reverse lock structure prevents the bracketconnector accidently escape from the holder connector.

In some embodiments, the bracket connector is vertical to the holderconnector.

In some embodiments, a top plate of the driver box has a wire socket anda manual switch.

The wire socket is connected to a power wire and the manual switch isused for adjusting a setting of the light source.

In some embodiments, the top plate of the driver box further has arotation switch for continuously setting a maximum light intensity ofthe light source.

In some embodiments, the light source has a light source plate mountedwith LED modules.

The light source plate is connected to the light holder to connect tothe ground.

In some embodiments, multiple metal shafts are used for eletricallyconnecting the light source plate and the light holder.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates an exploded view of a downlight apparatus.

FIG. 2 illustrates a side view of the downlight apparatus of FIG. 1 .

FIG. 3 illustrates a top view of the downlight apparatus of FIG. 1 .

FIG. 4 illustrates a cross-sectional view of the example in FIG. 1 .

FIG. 5 illustrates a perspective view of the leaf spring and the lighthousing.

FIG. 6 illustrates a top view of the example in FIG. 5 .

FIG. 7 illustrates a bottom view of the example in FIG. 5 .

FIG. 8 illustrates a side view of the example in FIG. 5 .

FIG. 9 illustrates a zoom-up view of a portion of the example in FIG. 5.

FIG. 10 illustrates a zoom-up view of a connection among multiplecomponents.

FIG. 11 illustrates another bottom view of another example.

FIG. 12 illustrates a side view of another example.

FIG. 13 illustrates a wave structure pad example.

FIG. 14 illustrates another example of a light housing.

FIG. 15 illustrates a top view of the example in FIG. 14 .

FIG. 16 illustrates an example of a wave structure pad.

FIG. 17 illustrates another view of the example in FIG. 16 .

FIG. 18 illustrates another view of the example in FIG. 16 .

FIG. 19 illustrates a combination of the shaft connector, the leafspring and the pad.

FIG. 20 illustrates another view of the example in FIG. 19 .

FIG. 21 illustrates a driver box example.

FIG. 22 illustrates another view of the example in FIG. 21 .

FIG. 23 illustrates another view of the example in FIG. 21 .

FIG. 24 illustrates a connector example.

FIG. 25 illustrates a component in FIG. 24 .

FIG. 26 illustrates another component in FIG. 24 .

FIG. 27 illustrates the connector disposed on a light source plate.

FIG. 28 illustrates an electricity distance diagram.

FIG. 29 illustrates another downlight example.

FIG. 30 illustrates the example in FIG. 29 with a wire connector.

FIG. 31 illustrates a fixing bar placed on a light housing.

FIG. 32 illustrates a heat dissipation plate placed between a driver boxand a light housing.

FIG. 33 illustrates a screw for transmitting heat.

FIG. 34 illustrates a driver box example.

FIG. 35 illustrates a heat dissipation plate in an elongated form.

FIG. 36 illustrates a connector for connecting components.

FIG. 37 illustrates an exploded view of another downlight embodiment.

FIG. 38 illustrates a component in the example of FIG. 37 .

FIG. 39 illustrates a bottom view of the example in FIG. 37 .

FIG. 40 illustrates another example in a cross-sectional view.

FIG. 41 illustrates a zoom-up view of a connection between components.

FIG. 42 illustrates a reflective cup example.

FIG. 43 illustrates a top view of the example in FIG. 42 .

FIG. 44 illustrates a side view of the example in FIG. 42 .

FIG. 45 illustrates a top view of a light housing.

FIG. 46 illustrates another top view of the light housing example inFIG. 45 .

FIG. 47 illustrates a cross-sectional view of the example in FIG. 46 .

FIG. 48 illustrates a diffusion cover.

FIG. 49 illustrates a side view of a downlight example.

FIG. 50 illustrates a top view of the example in FIG. 49 .

FIG. 51 illustrates another view of the example in FIG. 50 .

FIG. 52 illustrates an exploded view of the example in FIG. 51 .

FIG. 53 illustrates an elastic plate example.

FIG. 54 illustrates a connector example.

FIG. 55 illustrates another connector example.

FIG. 56 illustrates a torsion spring zoom-up view.

FIG. 57 illustrates another downlight example.

FIG. 58 illustrates a top view of the example in FIG. 57 .

FIG. 59 illustrates another view of the example in FIG. 58 .

FIG. 60 illustrates an exploded view of the example in FIG. 59 .

FIG. 61 illustrates a connector example.

FIG. 62 illustrates a torsion spring zoom-up view.

FIG. 63 illustrates another downlight example.

FIG. 64 illustrates a top view of the example in FIG. 63 .

FIG. 65 illustrates another view of the example in FIG. 64 .

FIG. 66 illustrates an exploded view of the example in FIG. 65 .

FIG. 67 illustrates an elastic plate example.

FIG. 68 illustrates a connector example.

FIG. 69 illustrates a side view of a diffusion cover and relatedcomponents.

FIG. 70 illustrates a zoom-up view of the diffusion cover and relatedcomponents.

FIG. 71 illustrates a rim part example.

FIG. 72 illustrates another view of the example in FIG. 71 .

FIG. 73 illustrates a wiring unit example.

FIG. 74 illustrates an exploded view of the example in FIG. 73 .

FIG. 75 illustrates a driver box with the wiring unit.

FIG. 76 illustrates a side view of the wiring unit.

FIG. 77 illustrates another view of the wiring unit.

FIG. 78 illustrates another view of the wiring unit.

FIG. 79 illustrates a fixing bracket example.

FIG. 80 illustrates another fixing bracket example.

FIG. 81 illustrates an elastic stop unit example.

FIG. 82 illustrates a top view of a downlight example with the fixingbracket.

FIG. 83 illustrates another view of the example in FIG. 82 .

FIG. 84 illustrates a top view of another downlight example.

FIG. 85 illustrates another view of the example in FIG. 84 .

FIG. 86 illustrates a component in the example of FIG. 85 .

FIG. 87 shows another downlight example.

FIG. 88 shows a range diagram.

DETAILED DESCRIPTION

In FIG. 87 , a downlight apparatus includes a light source 6003, a lightholder 6004, a driver box 6002, a fixing bracket 6001 and two torsionsprings 6010.

The light holder 6004 is used for placing the light source 6003. Thelight holder 6004 has a first side 6012 defining a light opening 6011.

The driver box 6002 is placed on a second side 6013 of the light holder6004.

The driver box 6002 contains a driver 6011 for converting an externalpower to a driving current supplied to the light source 6003 to emit alight from the light opening 6011.

The fixing bracket 6001 is coupled to the light holder 6004 for fixingto an installation cavity, e.g. a cavity in a ceiling or a junction box.A junction box refers to a metal or a plastic box pre-installed in acavity or other platform for inserting a downlight apparatus.

The fixing bracket 6001 has a bottom plate 6005 and two connector plate6006.

The bottom plate 6005 is fixed to the second side 6013 of the lightholder 6004.

The two connector plates 6006 are disposed vertically to the bottomplate 6005.

Specifically, the two connector plates 6006 may be disposed with 90 orsimilar angle with respect to the bottom plate 6005.

Each connector plate 6006 has two side units.

FIG. 67 shows an example of the connector plate 44301. The connectorplate 44301 has two side units 440302 on two sides of the connectorplate 44301.

In FIG. 87 , each torsion spring 6610 has an elastic center and twoarms.

FIG. 57 shows such an example. In FIG. 57 , a torsion spring has anelastic center 555 with two arms 553.

The two arms 553 are elastically spreading with different angles withrespect to the elastic center 555. When an external force is applied onthe two arms 553, the angle between the two arms 553 is changed, thuschanging a spreading span of the two arms 553.

The spreading span is changed to insert the torsion springs into ajunction box.

In FIG. 87 , the two torsion springs 6610 are attached to a lateral sideof the two connector plates 6006.

Either the two torsion springs are elastically squeezed to engage theinstallation cavity 6016 or the side units of the connector plates 6006are elastically squeezed to engage the installation cavity.

There are several sizes of junction boxes defining different diametersof the installation cavity 6016. In some larger installation cavity, thetorsion springs are used for attaching the downlight apparatus to theinstallation cavity. In some smaller installation cavity, the side unitsof the connector plates 6006 engages the installation cavity to attachthe downlight apparatus to the installation cavity.

In some embodiments, the installation cavity is a cavity in a junctionbox.

In FIG. 66 , the bottom plate of the fixing bracket has a central hole44991 for the driver box to pass through.

In FIG. 66 , the driver box or the holder plate has an elastic hook44992.

When the central hole 44991 of the bottom plate passes reaches a bottomedge of the driver box, the elastic hook 44992 locks the bottom plate tothe second side of the light holder.

In FIG. 66 , the bottom plate has multiple connection holes 441 forfixing the bottom plate to the installation cavity with bracketconnectors, e.g. screws.

In some embodiments, the connection hole is a key hole with an largerentrance 44101 and a smaller siding track 44102, as shown in FIG. 66 .

The bracket connector enters the larger entrance and then stays in thesliding track to fix the bottom bracket to the installation cavity.

In FIG. 66 , the connector plates 443 are detachable from the bottomplate 442.

In some embodiments, the connector plates are fixed to the bottom platewith screws, as shown in the exploded view in FIG. 66 .

In FIG. 66 , the two side units 44302 are two folded plates folding withrespect to a main body 44301 of the connector plate 443.

In some embodiments, a folding angle of the folded plate with respect tothe main body of the connector plate is larger than 90 degrees.

In some embodiments, the connector plates are made as the same metalpiece as the bottom plate and are folded vertically with respect to thebottom plate.

In some embodiments, the fixing bracket has a scraper, e.g. a sharpensurface or a wave structure 112 in FIG. 18 for scraping a portion ofelectric insulation layer on the second side of the light holder forelectrically connecting the light holder to ground.

In FIG. 88 , the light source includes multiple LED modules distributedin a first range 6033.

The bottom plate on the holder plate 6031 of the light holder has alarger size 6032 than the first range to carry heat of the first rangeoutside the first range.

In FIG. 83 , the bottom plate has multiple bracket connectors 962.

The second side of the light holder has corresponding multiple holderconnectors 963.

The bracket connectors 962 are respectively slided to engage the holderconnectors 963 by rotating the light holder with respect to to thefixing bracket.

In FIG. 81 , a reverse lock structure 9643 prevents the bracketconnector 963 accidently escape from the holder connector 963.

In some embodiments, the bracket connector is vertical to the holderconnector, as shown in FIG. 83 .

In FIG. 87 , a top plate of the driver box has a wire socket 6007 and amanual switch 6008.

The wire socket 6007 is connected to a power wire and the manual switch6008 is used for adjusting a setting of the light source.

In some embodiments, the top plate of the driver box further has arotation switch 6009 for continuously setting a maximum light intensityof the light source.

In some embodiments, the light source has a light source plate mountedwith LED modules.

The light source plate is connected to the light holder to connect tothe ground.

In FIG. 87 , multiple metal shafts 6010 are used for electricallyconnecting the light source plate and the light holder.

FIG. 1 illustrates an exploded view of a downlight apparatus.

FIG. 2 illustrates a side view of the downlight apparatus of FIG. 1 .

FIG. 3 illustrates a top view of the downlight apparatus of FIG. 1 .

FIG. 4 illustrates a cross-sectional view of the example in FIG. 1 .

FIG. 5 illustrates a perspective view of the leaf spring and the lighthousing.

FIG. 6 illustrates a top view of the example in FIG. 5 .

FIG. 7 illustrates a bottom view of the example in FIG. 5 .

FIG. 8 illustrates a side view of the example in FIG. 5 .

FIG. 9 illustrates a zoom-up view of a portion of the example in FIG. 5.

FIG. 10 illustrates a zoom-up view of a connection among multiplecomponents.

FIG. 11 illustrates another bottom view of another example.

FIG. 12 illustrates a side view of another example.

FIG. 13 illustrates a wave structure pad example.

FIG. 14 illustrates another example of a light housing.

FIG. 15 illustrates a top view of the example in FIG. 14 .

FIG. 16 illustrates an example of a wave structure pad.

FIG. 17 illustrates another view of the example in FIG. 16 .

FIG. 18 illustrates another view of the example in FIG. 16 .

FIG. 19 illustrates a combination of the shaft connector, the leafspring and the pad.

FIG. 20 illustrates another view of the example in FIG. 19 .

FIG. 21 illustrates a driver box example.

FIG. 22 illustrates another view of the example in FIG. 21 .

FIG. 23 illustrates another view of the example in FIG. 21 .

FIG. 24 illustrates a connector example.

FIG. 25 illustrates a component in FIG. 24 .

FIG. 26 illustrates another component in FIG. 24 .

FIG. 27 illustrates the connector disposed on a light source plate.

FIG. 28 illustrates an electricity distance diagram.

FIG. 29 illustrates another downlight example.

FIG. 30 illustrates the example in FIG. 29 with a wire connector.

FIG. 31 illustrates a fixing bar placed on a light housing.

FIG. 32 illustrates a heat dissipation plate placed between a driver boxand a light housing.

FIG. 33 illustrates a screw for transmitting heat.

FIG. 34 illustrates a driver box example.

FIG. 35 illustrates a heat dissipation plate in an elongated form.

FIG. 36 illustrates a connector for connecting components.

FIG. 37 illustrates an exploded view of another downlight embodiment.

FIG. 38 illustrates a component in the example of FIG. 37 .

FIG. 39 illustrates a bottom view of the example in FIG. 37 .

FIG. 40 illustrates another example in a cross-sectional view.

FIG. 41 illustrates a zoom-up view of a connection between components.

FIG. 42 illustrates a reflective cup example.

FIG. 43 illustrates a top view of the example in FIG. 42 .

FIG. 44 illustrates a side view of the example in FIG. 42 .

FIG. 45 illustrates a top view of a light housing.

FIG. 46 illustrates another top view of the light housing example inFIG. 45 .

FIG. 47 illustrates a cross-sectional view of the example in FIG. 46 .

FIG. 48 illustrates a diffusion cover.

FIG. 49 illustrates a side view of a downlight example.

FIG. 50 illustrates a top view of the example in FIG. 49 .

FIG. 51 illustrates another view of the example in FIG. 50 .

FIG. 52 illustrates an exploded view of the example in FIG. 51 .

FIG. 53 illustrates an elastic plate example.

FIG. 54 illustrates a connector example.

FIG. 55 illustrates another connector example.

FIG. 56 illustrates a torsion spring zoom-up view.

FIG. 57 illustrates another downlight example.

FIG. 58 illustrates a top view of the example in FIG. 57 .

FIG. 59 illustrates another view of the example in FIG. 58 .

FIG. 60 illustrates an exploded view of the example in FIG. 59 .

FIG. 61 illustrates a connector example.

FIG. 62 illustrates a torsion spring zoom-up view.

FIG. 63 illustrates another downlight example.

FIG. 64 illustrates a top view of the example in FIG. 63 .

FIG. 65 illustrates another view of the example in FIG. 64 .

FIG. 66 illustrates an exploded view of the example in FIG. 65 .

FIG. 67 illustrates an elastic plate example.

FIG. 68 illustrates a connector example.

FIG. 69 illustrates a side view of a diffusion cover and relatedcomponents.

FIG. 70 illustrates a zoom-up view of the diffusion cover and relatedcomponents.

FIG. 71 illustrates a rim part example.

FIG. 72 illustrates another view of the example in FIG. 71 .

FIG. 73 illustrates a wiring unit example.

FIG. 74 illustrates an exploded view of the example in FIG. 73 .

FIG. 75 illustrates a driver box with the wiring unit.

FIG. 76 illustrates a side view of the wiring unit.

FIG. 77 illustrates another view of the wiring unit.

FIG. 78 illustrates another view of the wiring unit.

FIG. 79 illustrates a fixing bracket example.

FIG. 80 illustrates another fixing bracket example.

FIG. 81 illustrates an elastic stop unit example.

FIG. 82 illustrates a top view of a downlight example with the fixingbracket.

FIG. 83 illustrates another view of the example in FIG. 82 .

FIG. 84 illustrates a top view of another downlight example.

FIG. 85 illustrates another view of the example in FIG. 84 .

FIG. 86 illustrates a component in the example of FIG. 85 .

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. However, theillustrative discussions above are not intended to be exhaustive or tolimit the invention to the precise forms disclosed. Many modificationsand variations are possible in view of the above teachings.

The embodiments were chosen and described in order to best explain theprinciples of the techniques and their practical applications. Othersskilled in the art are thereby enabled to best utilize the techniquesand various embodiments with various modifications as are suited to theparticular use contemplated.

Although the disclosure and examples have been fully described withreference to the accompanying drawings, it is to be noted that variouschanges and modifications will become apparent to those skilled in theart. Such changes and modifications are to be understood as beingincluded within the scope of the disclosure and examples as defined bythe claims.

The invention claimed is:
 1. A downlight apparatus, comprising: a lightsource; a light holder for placing the light source, the light holderhas a first side defining a light opening; a driver box placed on asecond side of the light holder, wherein the driver box contains adriver for converting an external power to a driving current supplied tothe light source to emit a light from the light opening; a fixingbracket coupled to the light holder for fixing to an installationcavity, wherein the fixing bracket has a bottom plate and two connectorplate, wherein the bottom plate is fixed to the second side of the lightholder, wherein the two connector plates are disposed vertically to thebottom plate, wherein each connector plate has two side units; and twotorsion springs, wherein each torsion spring has an elastic center andtwo arms, wherein the two arms are elastically spreading with differentangles with respect to the elastic center, wherein the two torsionsprings are attached to a lateral side of the two connector plates,wherein either the two torsion springs are elastically squeezed toengage the installation cavity or the side units of the connector platesare elastically squeezed to engage the installation cavity, wherein thebottom plate has multiple bracket connectors, wherein the second side ofthe light holder has corresponding multiple holder connectors, whereinthe bracket connectors are respectively slided to engage the holderconnectors by rotating the light holder with respect to the fixingbracket.
 2. The downlight apparatus of claim 1, wherein the installationcavity is a cavity in a junction box.
 3. The downlight apparatus ofclaim 1, wherein the bottom plate of the fixing bracket has a centralhole for the driver box to pass through.
 4. The downlight apparatus ofclaim 3, wherein the driver box has an elastic hook, wherein when thecentral hole of the bottom plate passes reaches a bottom edge of thedriver box, the elastic hook locks the bottom plate to the second sideof the light holder.
 5. The downlight apparatus of claim 1, wherein thebottom plate has multiple connection holes for fixing the bottom plateto the installation cavity with bracket connectors.
 6. The downlightapparatus of claim 5, wherein the connection hole is a key hole with anlarger entrance and a smaller sliding track, wherein the bracketconnector enters the larger entrance and then stays in the sliding trackto fix the bottom bracket to the installation cavity.
 7. The downlightapparatus of claim 1, wherein the connector plates are detachable fromthe bottom plate.
 8. The downlight apparatus of claim 7, wherein theconnector plates are fixed to the bottom plate with screws.
 9. Thedownlight apparatus of claim 1, wherein the two side units are twofolded plates folding with respect to a main body of the connectorplate.
 10. The downlight apparatus of claim 9, wherein a folding angleof the folded plate with respect to the main body of the connector plateis larger than 90 degrees.
 11. The downlight apparatus of claim 1,wherein the connector plates are made as the same metal piece as thebottom plate and are folded vertically with respect to the bottom plate.12. The downlight apparatus of claim 1, wherein the fixing bracket has ascraper for scraping a portion of electric insulation layer on thesecond side of the light holder for electrically connecting the lightholder to ground.
 13. The downlight apparatus of claim 1, wherein thelight source comprises multiple LED modules distributed in a firstrange, wherein the bottom plate has a larger size than the first rangeto carry heat of the first range outside the first range.
 14. Thedownlight apparatus of claim 1, wherein a reverse lock structureprevents the bracket connector accidently escape from the holderconnector.
 15. The downlight apparatus of claim 1, wherein the bracketconnector is vertical to the holder connector.
 16. The downlightapparatus of claim 1, wherein a top plate of the driver box has a wiresocket and a manual switch, wherein the wire socket is connected to apower wire and the manual switch is used for adjusting a setting of thelight source.
 17. The downlight apparatus of claim 16, wherein the topplate of the driver box further has a rotation switch for continuouslysetting a maximum light intensity of the light source.
 18. The downlightapparatus of claim 1, wherein the light source has a light source platemounted with LED modules, wherein the light source plate is connected tothe light holder to connect to the ground.
 19. The downlight apparatusof claim 18, wherein multiple metal shafts are used for electricallyconnecting the light source plate and the light holder.